As the city receives a typhoon alert, the girls recall an incident when they explored a supposedly haunted hotel. With no one quite sure of what actually happened, they try using the wishing rock to remember, although it doesn't appear to work at first. However, when they get home, they find that their younger selves from four years ago are walking about. The girls follow their younger selves as they prepare to explore the haunted hotel, oblivious to the time period they are in or the approaching typhoon. As they reach the hotel, the girls find their younger selves who, believing them to be ghosts, attack them and lock them in a room. There, they realize that their younger selves are here as a result of a wish on the rock they made to see what they were like four years later. As the typhoon soon appears, the young girls are put in a dangerous situation but are rescued by their older selves.
ある晴れた日。午後から台風が来るというニュースを聞いて、４年前にあった台風に関する出来事を思い出そうとする夏海たち。しかし、どこか記憶が曖昧で、４人の記憶がどうもかみ合わない。じゃぁ誰の記憶が正しいのか、「あの日のことを思い出させてください」と御石様にお願いする。しかし、特に記憶が戻ってきた感じもなく夏海たちが不思議がっていると４人の前に現れたのは―。
